3500

2,350

N2 q2 1,770 N2

From Equation 31-8, power requirement at 1,750 rpm would be:

/Nj \3_ bhp1 _(3,500\3_ 261 (N7 _ ~bhhp2 _ (1770 ) _ ~bhp~ '

Figure 31-31 is a generic representation of a speed versus power curve that indicates the potential benefits of variable speed operation. Table 31-2 provides a numerical summary of the relationship. As shown, a 20% reduction in speed (and flow) will result in a 50% reduction in required power. It is important to note, however, that the indicated power reduction may not be fully achievable in practice due to pressure losses in piping runs, throttling at individual loads, or hydraulic lift requirements.

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